Transformer.



J. J, FRANK.

TRANSFORMER. APPLICATION FILED DBC.17, 1907 91 9,338, Patented. Apr. 27, 1909.

Fig; 4 fig. 5 I I IITNESSES- fiYS/TEZYTUR mikgs JOHN J FHAA'K.

g. gm WM B 1 listing-currenttransformers of'the'core t fi'u nbers of tion of the core and its windin ,.and such Ito be carried out; Figs. 2 to Joins J. runs, or sonasno'ranr", NEW YORK, issrcnoaro GENERAL memo consist, I I AI'CORPORATION or-usw roan.

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To all whom it may concemf' Be it known that 1, Joan J. FRANK, a citizen of the United States, residin at Schenectady, county of Schenectady, tate of New 5 York, have invented certain new and useful Im rovements in Transformers, of whichthe fo owing is a specification.

My invention relates especially to alterand more es ially totransformers w ch of polgphase electric circuits;

n he ast it has been the custom to usefor tra orming poly' hase. circuits either a number of individua singlehase transformers suitably interconnects or a sin l'e -polyphase unit such, for example, as t e threehase transformen. If, however, it is desire to transform the energy of electric circuits of. a difierent number of phases, if

individual sin le-phase transformers are used, it either comes necessary'to cut one of these out, or to add thereto; or if a pol hase transformer is used upon a circuito a erent num'benof phasesthan that for which it was originally designed, the trans forms! "can either not be operated, or, 'for example, in 'the'case of a threephase'transformer operating upon a two-p ase circuit,

80 it'will be operated with a great lack of efficiency as a considerable amount of the wind- .finglwillbeidle. I I I y invention seeks to.construct a trans former which ma. be operated chea lv and a5 'efliciently upon e ectri'c circuits of erent phases by a suitable construcf -suitable interconnections of t e windin s that the transformer me be operated wit 40 substantial the same egree of'efiicieipiy whether it .operated upon an? of the ferent phase-combinations for w rich it is dewhichaccompany, and are made I a. .part of this specificatlon. p a I Figure 1 shows diagrammatically one form -f of transformer in which m invention mayv til: combinations-of the which may '-made or o rat m tr ormeguponl I. oi difl rent numbers of 18'- togFig. 1, 1 shows a Specification Io! Letters Patent. Ahliotflon Med December 17, 1097. suinndzsoasso.

show certain of Patented a rn 27, mo e.

: nated'magnetic'core which may be made in any of the fashions'welliunderstood in the,

. art. This core is shown as constructed with 'four legs, and around the two center legs are 7 wound prima coils 2 '2, and secondary coils 3 3'.

Connected intermediately between the ends of these windings are shown certain taps 45, 6 -7, which are used in order to suitably connect the-transformer for operation uponthre'e-phase circuits.

are used fort e transformation of the energy In Fig. 2,- Ihave shown the connections for operating the transformer upon' a singlep ase circuit. P P} show the conductors of the primary circuit, and S, S show the conductors of thesecondary circuit, -Windings 2 2 and 3 .3 are shown as connected respectively'in parallel. I Fig; 3 shows a connection of my transformer for operation on a, three-phase circuit, the transformer being connectcdwith the so-calld double -"T connection. P P IPT, Show the-three conductors of the primarycircuit, and 8%, S 1, 5%, show the three conductors of the secondary circuit. In this connection tap 4,- which is connected to substantially the center oint of winding 1" 2is connected to ta 6, whic is connected a point on the win 'n which gives substan-ii tiall .866 of the num er of the turns of the? who e winding between'it and the end of the" 2' connected to P as is well under; stood mthe art, with the so-called Scott two hase' 'threephase connection. Thetaps and 7 are connected to windings 3 3'. in a fashion similar to taps 4 and 6, and this double-T connection are'connected to? I gether. I

Fig. 4 shows a connection for operating 'my. transformer on a three-phase circuit withso-called open delta connection. P '95 P and P 5 show the primer conductors of a three-phase circuit, and 'S and 8' mg; I I show-the secondary conductors of: a threeora further understanding of mv inven- 45 tion, reference maybe had-to the drawings hase circuit. The primary windings 2 and D are both connects at one end to one con- 10c ductor of the three pha'se circuit, and at'the other end are each connected to a conductor of the three-phase circuit. The seconds windings are-similarly connected. I

5 shows a'connection of my trans4-105 former for transforming from a two-phase currentto a three-phase current. In this connection windings 2 and 2 are connected to the prima conductors of the two phases I P,, P, and P,, and the secondary wind-- 11 i 3 9 t thesecond e ns dm'wfe of the wphese circuit S, s,

the ta 5 end 7 being connected together.

. I here not shown ell the connections 5 whichmey he mdde with my new formed trnnsiomer, mnny others me which wilt Em ohmous to those s d in the For exnmpinmy trensiormermey he operetcd tor trnnsio irom'two phese tom tten-phase in connecting the secondnry win. 3 en 3 ends to one pheee of s twothe we fieslnon es in 5 Also it nitfin phase one 2 end *fiere connected.

ti mm:

win will he obvious that 'whiie I heve reirred to I by tt-Willdiflg, I have ze-onlyshown such e construction oi trans=- former for the purpose of describing 'one embodiment of my invention, and it will he obvious to those skilled in the art that my invention is ce'pehle of many other embodi- -ments without departing from its spirit. n will also be obvious that the tflps on the windings intermediate the ends of the windg y desired, or additional ta s me be'emp 0' ed, ii it is desired to change t e vo tsges onwhich in transformer is to operate. do not denre to hmit m&self tothe perticuler construction and to e arrangement 'of win which I have here shown, end 40 ch es .w ch do not departfrom my inventlon, and which are within the scopeof the present claims willbe obvious to those skilled in the a'rt.-

*whetlclaimasnemanddesiretosecure.

by Letters Patent of the United States, is,-

1, The combination, in a, transformer, of e he made,

'iegs enrnonn legs surrounded .eech BQPQIEdQIY '0, m

center twoof which have their positions eltered if so silence core-with ser nity of is, ism in secondary windings surrounding certain of the legs, and connections on the primery end secondary for connecting the transto fewer for o eretion on cunent. sources oi veriehlennm ere v 2, The comhinetionen e trensformer oiie, core-with e lnmllit oi legs, certein oi the by as primary and set secondery m1 nndconnections on eech winding intermediete the .end connections for connecting the trensiormer' tor operstion on current sources it veriehle numbers of pheses'. v

3. The comhinetion, in e coretype oi transformer, of s plurality oi legs, two oi the by as primary. end s end connections on eech 1 w nding interm-i= the end-connections so for connecting the trensiormer for operation I on current sources of veriehle numbers of d. The combination in s core type oi trensiomien oi e piureiity of legs, two oi the we legs surrounded-each by a. primary end a seconds win and connections on each winding intermediete the end-connections so err ed that: the transformer may be connect for o eretion on single-phase twophase three-p see and three-phase two-phase. ,1 circuits.

v 5. The combination, in 2. core type trensformer of a core with four legs, a primary and e seconds winding esch surrounding the two center egs of. the core, and connections from each winding intermediate its end-connections for connectingthe transformer for -o eretlon on single-phase two-phase three p we or three-p ese two-phase electric cir- 85, our

' In witness whereof, Iheve hereunto set my hand this 16th day of December, 1907.

- 'q- 'JOHNJFRANK. Witnesses:

Oar-om meimnweom 

